Syntheses and electrochemical properties of three supramolecular architectures based on Keggin silicontungstates and different metal-organic units |
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| Authors: | Chunjing Zhang Zhuanfang Zhang Ying Guo Heng Liu Huiyuan Ma Bo Liu Haijun Pang Shaobin Li |
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| Institution: | 1.Key Laboratory of Green Chemical Engineering and Technology of College of Heilongjiang Province, College of Chemical and Environmental Engineering,Harbin University of Science and Technology,Harbin,People’s Republic of China;2.Heilongjiang University of Chinese Medicine,Harbin,People’s Republic of China |
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| Abstract: | Three new compounds Mn(H2O)2(bimb)2(H3SiW12O40)2](bimb)4 (1), Zn2(bimb)4(H2O)4]SiW12O40] (2), and Ni2(bimb)4(H2O)4]SiW12O40] (3) (bimb = 1,3-bis(1-imidazoly)benzene) have been synthesized under the same hydrothermal reaction except for tuning the metal cations (Mn2+, Zn2+, and Ni2+). Structural characterizations show that the three compounds possess distinct structural motives. Compound 1 displays a supramolecular one-dimensional (1 D) chain formed by π···π interactions that occur among the almost parallel bimb ligands from adjacent Mn(H2O)2(bimb)2(SiW12O40)2] dimers. Compound 2 shows a supramolecular two-dimensional (2D) layer achieved by intermolecular (C–H···O) hydrogen bondings between the Zn2(bimb)4 molecular loops and the SiW12 anions. Compound 3 also exhibits a supramolecular 2D layer, but it is different from 2, which is generated by the π···π interactions among adjacent 1D polymeric chains. The distinct structural features of the three compounds suggest that the metal cations should play a significant role in the process of assembly. Additionally, the electrochemical properties of compounds 1–3 have been investigated, and the results indicate that compounds 1–3 possess excellent electrocatalytic activity toward reduction of both iodated and nitrite molecules. |
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